Process for the manufacture of combs from celluloid.



UNITED STATES Patented May 10, 1904.

PATENT OFFICE.

CARL BENSINGER, OF MANNHEIM, GERMANY.

PROCESS FOR THE MANUFACTURE OF COMBS FROM CELLULOID.

SPECIFICATION forming part of Letters Patent No. 759,413, dated May 10, 1904.

Application filed December 24, 1902- To all 1072,0111 it may concern.-

Be it known that I, CARL BENSINGER, a subject of the Grand Duke of Baden, whose postoifice address is No. 16 Block M Mannheim, Grand Duchy of Baden, German Empire,have invented a new and useful Process for the Manufacture of Combs from Celluloid; and I do hereby declare that the following is a full, clear, and exact description of my invention, which will enable others skilled in the art to which it appertains to make and use the same.

The process which has been hitherto carried out in practice in the manufacture of celluloid combs, as described in the United States Patent No. 688,223 and in reissued Letters Patent No. 11,976, has for its essential feature that it is performed in two separate stages or operations, the first stage or operation consisting in forming rou h blanks or lates which in their outline resemble already the general shape of a comb and in the preparation of which any alteration of molecular tension or strain is avoided, while in the second operation the (rough) blank so obtained is by means of a press or mold constructed in two parts pressed into the final shape of a comb. In other words, the teeth of the comb are at this stage or operation pressed or driven through. In carrying out these processes the important point is that the celluloid formed into blanks which are to be placed in the press for final molding should bear an exactly-predetermined relation to the final article to be produced and that While a blank is being pressed into the shape of a finished comb any tearing or disruption of the molecules shall be avoided, so that by one pressing operation only the comb shall receive its final shape.

In accordance with the present invention the process of manufacture of celluloid combs delineated above is intended to be improved in this particular, that the celluloid in the moldpressing stage shall be not pressed through, but forced or driven into the grooves of the engraved mold. Hence it is no longer necessary preliminarily to shape the blank Serial No. 136,467. (No specimens.)

corresponding to the shape of a comb in general outline, it being sufiicient for such blanks to be approximately equivalent to the finished comb in volume or bulk, so that during the molding operation the grooves carved or engraved in the press or mold may be completely filled with celluloid. It is of advantage also to determine the volume or dimension of the blank, so that the length of the blank shall be about equal to the length of the comb and its thickness or depth approximately equal to that of the back of the comb. The blank is introduced in the mold in such a manner that when pressure is applied to the mold the material is driven in the direction toward the points of the grooves which correspond to the teeth, these grooves forming channels for the flowing celluloid.

The process does not resemble the ordinary process of compression whereby the material is compressed from every part of the mold, but resembles rather the process of manufacturing macaroni, (Italian paste.) The pressure is to be continued until the teeth of the comb are definitely formed. Excessive strains and rupture of the molecular construction are thus avoided.

What I claim, and desire to secure by Letters Patent of the United States, is

The process of making celluloid combs which consists in forming blanks approximately equivalent in volume and length to the finished com b, and in thickness to the back of the finished comb, introducing the blank into a mold, and applying pressure and heat and thereby driving the celluloid into the channels formed by the teeth of the mold and in the direction toward the points of the teeth, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

CARL BENSIN GER.

Witnesses:

JACOB June, H. E. KEEPF. 

